180 
U. S P. R, E. EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 
List of specimens. 
Sex and 
age. 
3 
3 
Locality. 
When col- 
lected. 
Whence obtained. 
Orig. 
No. 
Collected by- 
Length. 
Stretch 
of wings. 
Wing. 
Remarks. 
I'ctaluma, Sonoma Co., 
681 
663 
April — , 1856 
2 
9 
o 3 
Lt. R. Williamson 
John X. de Vesey. . 
Colorado bottom, Cal... 
Mar. 31, 1854 
Dec. 31, 1854 
June — , 1853 
38 
3t> 
3 
32 
Major Emory 
221 
Q 
Saltillo, Coaliuila, Mex. 
1\fpTir>n 
May — , 1853 
8.00 
11.50 
3.62 
Eyes dark brown, bill 
black, feet dark slate. 
Catal 
No. 
7J11 
7213 
MYIARCHUS COOPERI, Baird. 
Tyrannula cooperi, Kaup, Pr. Zool. Soc. 1851, 51, (not of Nuttall.) 
Sp. Ch. — Width of bill above grayish olive. Throat and upper part of breast light ash gray ; rest of under parts pale sulphur 
yellow. Two light-colored bands on the wings ; the primaries, except the first, margined externally and internally with rufous. 
Tail feathers rufous, the outer webs, and a stripe on the inner side of the shaft extending in a straight line to the tip, brown. 
This inner stripe is a little wider than the outer web on the outer feather, but diminishes somewhat to the central ones. 
Length, 8.50 ; wing, 4 ; tail, 3.90 ; tarsus, .95. 
Hab. — Mexico. 
This species of flycatcher is very similar to 31. crinitus, and, in fact, occupies a position inter- 
mediate in color between it and mexicanus, though, larger, perhaps, than either. The superiority 
in size over 31. crinitus is chiefly noticeable in the tarsus, which is about .12 of an inch longer, 
and in the bill ; the wing is, however, shorter. The third quill is longest ; the second and fourth 
but little less ; the first a little longer than the seventh. The coloration is much the same 
with mexicanus, being considerably paler and grayer than crinitus. The yellow of the breast is 
a little deeper than in mexicanus, and the throat a very little darker. The upper parts are like 
mexicanus, and there is a decided pure gray shade on the forehead and on the back of the neck, 
and to a less extent on the rump. 
This species differs from crinitus, as stated, in the larger bill and tarsi, and shorter wings, 
with a much paler tint of coloration. Both have the tail similar in the continuation of the 
reddish of the tail to the extreme tip, instead of having this tip brown as in mexicanus. The 
tail is more nearly even, however, and the brown stripe on the inside of the shaft is wider than 
the outer web on the exterior feather, as wide on the second, and gradually diminishing to the 
fifth, where it is about one-fourth the width of the outer web. In 31. crinitus the brown stripe 
on the inner web is scarcely half the width of the outer web, and quite pale. On the fifth 
feather it does not cross the shaft at all ; while in some specimens this color is scarcely appreci- 
able on the inner webs of any but the exterior leathers. The bill is quite black. 
From mexicanus this species is distinguished by the larger size and much broader bill 
